Trip-recording compass for aeroplanes



naled in one end in a bracket 22 on one side of the rim oit the bowl-like pendulum C7, and at its 'other end, journaled in the casing 23 that v.is rigidly secured to the opposite side of the rimA ot said pendulum and encloses a Watch movement that rotates the shaft 2l with a timed action.

AThe numeral 2li indicates a guide rod4 which, at one end, is pivoted to the casing 23, and at its other e u, extends through a vertical perforation 22 in the bracket 22 and has a downturned end that terminates in a head 25a.

The numeral 2G ind markerwhich, at its lo` icates the st f i `l VCI Silit.,

*with an ink Well 27 `and a. depending marliing point 28, which latter is'engageable directly with the record sheet 19. This stylus, at its upper end, has a pei-iteration through which the guide rodV 2er. is passed, and lower down it is provided with a vertically clon'- gated passage 29 through Wh h the it'ced shaft 2l. is extended. In the 'upper portion of the Slot 29 a threaded nut segn'ient 30 is inserted and' rigidly secured, normally, ttor direct engagement with the threads oi the feed shaft 21.

lorling vertically through a guide sleeve 3l in the bottoni oiI the casing 5 is a vertically movable trip rod plunger l2/the downward movement oli which is limited by a collar Afcciled spring 34- yieldingly presses the plunger ot the trip rod 32 doivn Ward. be engaged, either directly with the ground, or with some part ot.' the aeroplane in such manner that Whenever the aeroplane lands, said rod will be torced upward, as indicated by dotted lines in Fig. 2. and :into engagement With the head 25, thereby raising` the guide rod 2li; and .li'l'ting the nut segment 30 et.' the stylus 2G out ci eiigagement with the record sheet. This will more clearly hercinaitcr appear.

The operation et this device ris probably obvious itrouythe 'foregoing description, but may be summarized, as iliollo'ws:

When the aeroplane is in itlight, the stylus will be in contact with the recordj sheet 19 and will be n'ioved continuously radially tovvardthe axis ot the table 18. This table will, by the compasmbe held in a constant position, inrespect to north and south, and

The lower end oit thisrod 3l will hence, When the machine is flying onA an exact straight line, the stylus will mark a true radial line on the record sheet, but the position of this radial line, in respect to a certain niark, such as north, or a niark in dicating north on the record sheet, will in dicate the direction of the lliY lllhen other than a straight line is being traveled, a curved or crooked line will be marked on the record sheet. Of course, the stylus, ir' driven continuously by thethreaded i'eed will occupy predetermined positions, or difi'erent time intervals indicated by the Watch movement, and hence, itt there is any interruption or conflict bet iositions ol the stylus and time indi ated by the Watch vthen it will be clear that a stoi or' landing, has beeninade, and the total time otlanding can easily he determined. lMoreover, when a landing is made, as already stated, the trip .rod 32 Awill raise the guide rod 24 and the stylus 26, thus terminating, temporarily, the line markcdon the record sheet. Uien the machine, or aeroplane, again starts its flight, the stylus lwill again drop baclr into action, behind scheduled time indicated by the Watch, however, and

it' the aeroplane has been shifted to the least extent While en the ground, or has changed, to the least extent, its angi'ilar position in starting its llight, the new line will be started from a neivpo'int, thereby showing ay gap that will indicate the stop or landing( The radial -rlistance between the end of the recorded line'and the beginning oit the new line will indicate the time or' the stop. Even if it were possible to bring the stylus baclr to exactly the saine point, in starting a new line, there would be a dot or blot produced.

that would indicate 'the stop or landing. The concentric circles on the chart designate equal intervals ol movement ot the stylus. The time consumed in making a certain Hight, as recorded by the line on the chart can thus be quickly computed. The

curve on the chart hoivn designated as (l, in

lin i l., a resultant oli the n'iovenient et' the stylus by the shalft 2l and the movement et the chart relative to the r oll the device. The magnet or couipass "ends to hold the chart stationary and the est et the instrument Will. be turned the aermiilauc or other carrier turns. The nioifeinents olf the aeroplane or other member carrying the device in a straight line and the various turns made 'by the saine are thus registered and 'the direction ci5 the travel indicated. AThe north and 'south poles ot the compass are alsoY indicated'by the letters N and S in Fig. l. Y Y I This recorder ivill, therefore, reliably and accuratelyindicate'and record directions oi2 flight, time olf travel. in each direction, and stopsfor landings; and Ywhen the recorder is used in lconnection with` a speedometer,

lit willV afford means for readily determin- .ing distances traveled in each direction. This device is therefore, especially l adapted carried by said pendulum, a guidev roden tendedv alongv said feed shaft ybut capable of movement at one end, a stylus movable on for use inconnection with aeroplanesysuchf 'said-guiderod andhavinga nutsegment norlas mail carrying or messenger planes/which .v havepredetermined routes, and where itis advisable, or desirable to 'recordV justwhatV "madeV anjaeroplane is doing during its trips.

What I claim is: l l nl LA trip recording compass comprising a pendulum supported for'. universal self-l tion Awhen landingofthe aeroplaneV hasibeen 1 Vi2. A triprecording ycompass cemprising-a Y pendulum supported forV universall selfi arigliting nioiutments,#a horizontal table roT tatably mounted on said pendulum, -.a magi netic needle connectedtoY said table "andf maintaining a predetermined position there-f Sofi inV respect to Anorth and south, aj stylus movable oversaid table,jatime actuated feed device for said stylus,v and means "for, throwing said stylus temporarily out; of ac-,

Y rtion when landing of the aeroplane hasbeen made, said means comprisingxa depending. triprod arranged to be forced: upward toA accomplish said function. Y f

' 3. Altrip yrecording,*compasscomprising a pendulum mounted for universal'vself-,arighti i ,ing movements,v a horizontal record supportn ing table rotatably mounted on saidvp'endurlum and provided withl a.Hiltgletic` needle for maintaining a constantposition thereof i Ain respect' to northfandsouth, atime-actuaty ing threaded feedishaft journaled'insup;

ports carried by ysaid pendulum, a guide rod extended'alongsaid feed shaftbut capable/ of movement at one end, a stylus movable i on said-guide rod and having a nut segment normally engageable with thenthreads of saidl feed shaft, andmeans for raising said guide rod Hand'thereby moving the nutfrof said stylus out ofV engagement lwith* vthe thread of said feed shaft .when Ythe machine 4t. triprecordingfcompass comprising av pendulum mounted for universal self-aright-V ing movements, a horizontal record V'support-` ing table rotatably mounted on said 'pendul' lum a'ndprovided with a magnetic vneedle Vformaintaining a constant position thereof*"in respect to north and southpa time-actuating vthreaded feed shaft journaledin' supports l mally engageable with the threads of lsaid l' feed shaft, and means fory raising said guidev rod and thereby moving the nut of saidvsty., lus outof engagement with the thread of said ifeed shaft when `the machine malzes'a landing, said means'compri-singa normally depressed .trip rod adapted to' bemoved upward into engagement with the movable end of said guide vrod to accomplish said function. 5. In atrip-recording compass, the combination with a weighted b'owl comprising ay central upstandingpost mounted foruni- V Vversa-l.' self-arighted movements and fcontaining."liqiiid, a magnetic needle having ioats riding on the liquidicontained in said bowl and axially supported onv said post, a l ,disk-*like record supporting table supported sol on saidneedle, anda time-actuated stylus' ,Y movablel over said table, the latter having'`V supports Yand operatingmeansl carriedV by l said bowl.l

A GQ In a trip recording, compass, the .com-

bination` `with ai bowl comprising 'a penduj lum mounted'for universal self-arighted movements nand containingrliquid, a horizondisk-like record supporting table journaled' tosaid pendulum and providing the bowl of said pendulum `with a magnetic needle`hav ing floats-riding on the liquid contained inv said bowha time-actuated stylusv movable over said table,`the latterhaving supports 'Y and operating meanscarried by 'said pendu? lum, and means for automatically throwing saidfstylus temporarily-,out of action when' the machine :has made a landing. j

V7. Atrip recording compass having in combination a casing, a bowl pivotallv mounted therein on'a V plurality of intersect- `ing axes 'and having an integral weighted portion 'centrally therein comprising a standard, 'Ia magnetic needle 'mounted onY said standard; a recording table carriedv by said needle, I guiding Ymeans for fsaid table and needle and a styluscarriedby said bowl and actuatedV tomoveovcr said table.

" 8; A trip recording compassA havingv in iiocombination ya bowl pivotally rmounted ona plurality ofa'Xes com rising an integral Weighted vportioncentral ly disposed therein comprising ajstandard, liquid inV said bowl, a magnetic needle and table carried thereby and supported for rotationon said liquid and standard, and a stylus supported` and Y guided by means onsaid bowl and movableV v i across said table..

' l Joini irKLnMMn 

